作者：孙丹辉, 李 雨, 邓 涛
摘要：报道并描述了大唇犀属一新种——桑氏大唇犀(Chilotherium licenti sp. nov.), 材料为桑志华于1920年在甘肃庆阳晚中新世地层中采集到的一件关联寰椎的成年头骨和一件成年下颌骨。新种除了具有下颌联合部强烈扩展，i2巨大且内刃上翻，原尖收缩强烈，前刺和小刺发育，前附尖褶和前尖肋微弱等大唇犀属的典型特征之外，还具有前刺和小刺发育并连接形成中凹(P2-M2), 内外齿带退化等特征。新种的进步特征显示其属于大唇犀属内高度特化的类群。新种时代属于保德期，对应于欧洲的MN12-13。根据形态特征对比以及系统发育分析，推断来自晚中新世的桑氏大唇犀是大唇犀属内最进步的类群。
A new species of Chilotherium (Perissodactyla, Rhinocerotidae) from the Late Miocene of Qingyang, Gansu, China
SUN Dan-Hui, LI Yu, DENG Tao
Abstract An adult skull with articulated atlas and an adult mandible, collected by Emile Licent in 1920 from the Late Miocene of Qingyang (Gansu, China), is recognized as a new species Chilotherium licenti sp. nov. These specimens possess typical characters of the genus Chilotherium, such as the strongly expanded mandibular symphysis, the huge and dagger-shaped i2s with an upturned medial flange, strongly constricted protocones, well-developed crochet and crista, and weakly developed parastyle folds and paracone ribs. Chilotherium licenti is characterized by the near absence of lingual and buccal cingula, and the medifossette on P2 to M2 forming by well-developed crochet and crista. The derived characters of the new species indicate that it is the highly specialized taxon of the genus Chilotherium, corresponding to MN12-13 of the Turolian in Europe. Based on a phylogenetic analysis of rhinocerotids, C. licenti from the Late Miocene is the most derived species in the known species of the Chilotherium lineage.
Key words Qingyang, Gansu; Late Miocene; Rhinocerotidae, Chilotherium